Itching of the buttocks in warmer weather is mainly due to the large temperature difference outside, which stimulates the skin pores and triggers itching symptoms. When the skin is irritated by the outside world, exogenous itch-causing agents act on the skin tissues and induce the release of histamines, leading to itching. Itching may also occur due to overheating, prolonged sitting and poorly ventilated buttocks caused by poor quality clothing, which can breed bacteria or viruses.